Question

61

Create an object from an array of keys and an array of values

rated 0 times [ 62] [ 1] / answers: 1 / hits: 92940 / 8 Years ago, wed, august 24, 2016, 12:00:00

I have two arrays: newParamArr and paramVal.

Example values in the newParamArr array: [ "Name", "Age", "Email" ].

Example values in the paramVal array: [ "Jon", 15, "[email protected]" ].

I need to create a JavaScript object that places all of the items in the array in the same object. For example { [newParamArr[0]]: paramVal[0], [newParamArr[1]]: paramVal[1], ... }.

In this case, the result should be { Name: "Jon", "Age": 15, "Email": "[email protected]" }.

The lengths of the two arrays are always the same, but the length of arrays can increase or decrease. That means newParamArr.length === paramVal.length will always hold.

None of the below posts could help to answer my question:

Javascript Recursion for creating a JSON object

Recursively looping through an object to build a property list

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aidan

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answered 8 Years ago zachary · Accepted Answer

var keys = ['foo', 'bar', 'baz'];

var values = [11, 22, 33]



var result = {};

keys.forEach((key, i) => result[key] = values[i]);

console.log(result);

Alternatively, you can use Object.assign

result = Object.assign(...keys.map((k, i) => ({[k]: values[i]})))

or the object spread syntax (ES2018):

result = keys.reduce((o, k, i) => ({...o, [k]: values[i]}), {})

or Object.fromEntries (ES2019):

Object.fromEntries(keys.map((_, i) => [keys[i], values[i]]))

In case you're using lodash, there's _.zipObject exactly for this type of thing.